The Hobsons X9 Hex Head Seal Screw (10-16 x 16mm) is a premium self-drilling fastener designed for secure metal-to-metal fixing. Featuring an integrated sealing washer for superior weather resistance, it is ideal for roofing, cladding and general steel construction. Its #10-16 thread provides excellent holding strength while allowing for fast and efficient installation. Supplied in a convenient box of 1,000 screws, it is the perfect choice for trade professionals and large-scale projects.